Larval morphology of the diving beetle Celina and the phylogeny of ancestral hydroporines (Coleoptera:Dytiscidae:Hydroporinae)

2007 ◽  
Vol 21 (3) ◽  
pp. 239 ◽  
Author(s):  
Mariano C. Michat ◽  
Yves Alarie ◽  
Patricia L. M. Torres ◽  
Yoandri S. Megna
Keyword(s):  
Phylogenetic Relationships ◽  
Cladistic Analysis ◽  
Sister Group ◽  
Reduced Form ◽  
Larval Morphology ◽  
Unique Character ◽  
Phylogenetic Studies ◽  
Diving Beetles ◽  
The Family ◽  
First Time

Phylogenetic relationships within diving beetles (Dytiscidae) are imperfectly known. In particular, some authors have considered that the tribe Methlini is included in the subfamily Hydroporinae (a large group including about half of the dytiscid species worldwide), whereas others have argued in favour of excluding Methlini from the Hydroporinae and giving it subfamilial rank. Larval characters have been underutilised in phylogenetic studies, mainly because the larvae of many taxa within the family are still unknown. The larval morphology of the dytiscid tribe Methlini, in particular, remains poorly known. In this study, the phylogenetic relationships among ancestral lineages of the Hydroporinae are investigated based on a cladistic analysis of 34 taxa and 127 morphological larval characters. For this purpose, larvae of the Methlini (Celina parallela (Babington, 1841)) and C. imitatrix Young, 1979) are described and illustrated in detail for the first time, with particular emphasis on morphometry and chaetotaxy. The results show high support for a monophyletic origin of the Hydroporinae, including Methlini, based on eight unique character states. Giving Methlini subfamily rank would leave Hydroporinae with a single unique larval apomorphy. This supports the inclusion of Methlini as a tribe of Hydroporinae. Other interesting but less well supported results include: 1, the clade Laccornini + Hydrovatini + Canthyporus Zimmermann, 1919 (Hydroporini) resolved as the sister-group to the other Hydroporinae minus Methlini; and 2, Hydrovatini and Canthyporus resolved as sister-groups. The presence of a galea, albeit in a reduced form, in larvae of Methlini, Laccornini and Hydrovatini is of the utmost interest. The putative hypothesis of an ancestral position for these genera within Hydroporinae suggests that hydroporines lost the galea secondarily.

Phylogenetic relationships of the African genera Alestes and Brycinus (Teleostei, Characiformes, Alestidae)

2002 ◽  
Vol 80 (11) ◽  
pp. 1887-1899 ◽  
Author(s):  
Alison M Murray ◽  
Kathlyn M Stewart
Keyword(s):  
Phylogenetic Relationships ◽  
Cladistic Analysis ◽  
Sister Group ◽  
Monophyletic Group ◽  
The Family ◽  
The Subject

The family Alestidae (also referred to as the African Characidae) comprises the African dwarf forms ("Petersiini") and the genera Alestes, Brycinus, Bryconaethiops, and Hydrocynus. Although several authors have presented characters to support the monophyly of the family, a cladistic analysis of the group has not been published. Furthermore, the interrelationships of the constituent groups are the subject of some controversy. A cladistic analysis of the Alestidae is presented, including characters to support the monophyly of the family. The results of this study indicate that several species should be removed from the genus Brycinus, that Hydrocynus is the sister group of Alestes s.str. (containing only five species), and that the dwarf alestids ("Petersiini") do not form a monophyletic group.

Phylogenetic relationships of Leuronectes Sharp (Coleoptera: Dytiscidae: Agabinae) based on larval morphology and chaetotaxy

2009 ◽  
Vol 40 (2) ◽  
pp. 209-228 ◽  
Author(s):  
Miguel Archangelsky ◽  
Mariano Michat
Keyword(s):  
Phylogenetic Relationships ◽  
Abdominal Segment ◽  
Anterior Margin ◽  
Cladistic Analysis ◽  
Lateral Margin ◽  
Larval Morphology ◽  
The Third ◽  
Segment Viii ◽  
First Time ◽  
Diving Beetle

AbstractThe phylogenetic relationships of the diving beetle (Dytiscidae) genus Leuronectes Sharp are revised based on a cladistic analysis of seven Agabinae genera and 54 morphological and chaetotaxic characters from larvae. For this purpose, larvae of L. curtulus Régimbart are described and illustrated in detail for the first time, with particular emphasis on morphometry and chaetotaxy. The results show that Leuronectes is well placed within Agabinae based on the absence of natatory setae on tibia and tarsus in instars II and III, the urogomphus composed of two urogomphomeres, and the absence of secondary setae on urogomphus. Leuronectes is resolved as part of a basal polytomy along with Platynectes Régimbart and a clade formed by the remaining agabine genera. Leuronectes shares with Platynectes the setae UR2, UR3 and UR4 not inserted contiguously, with Platambus Thomson the anterolateral lobes of frontoclypeus not projected beyond anterior margin, with Hydrotrupes Sharp the seta AB9 inserted dorsolaterally, and with Ilybius Erichson the seta LA10 inserted submedially. Leuronectes is unique within Agabinae in having the apical lateroventral process of the third antennomere not protruding and additional ventroapical pores on third antennomere, and is unique within the dytiscid genera studied in having the seta LA12 inserted submedially and one additional spine-like seta inserted on the lateral margin of abdominal segment VIII.

New species, redescriptions and phylogenetic revision of tribe Dacini (Diptera: Tephritidae: Dacinae) from India based on morphological characters

Zootaxa ◽  
2019 ◽  
Vol 4551 (2) ◽  
pp. 101 ◽  
Author(s):  
K. J. DAVID ◽  
S. RAMANI
Keyword(s):  
New Species ◽  
Phylogenetic Relationships ◽  
Cladistic Analysis ◽  
Sister Group ◽  
Morphological Characters ◽  
Plant Character ◽  
The World ◽  
Two New Species ◽  
First Time ◽  
Phylogenetic Revision

The tribe Dacini comprising four genera, namely Bactrocera Macquart, Dacus Fabricius, Monacrostichus Bezzi and Zeugodacus Hendel, is a derived lineage in Tephritidae. It is one of the most economically important tribes in Tephritidae harbouring several species of quarantine concern across the world. We describe two new species of Bactrocera Macquart, B. (Parazeugodacus) conica David & Ramani, sp. n. & B. (B.) prabhui David, sp. n. from India. Postabdominal structures of males and/or females of 23 species of Bactrocera, 16 species of Zeugodacus and 8 species of Dacus from India are illustrated and described for the first time, which revealed similarities between Dacus and Zeugodacus with respect to epandrial shape and praeputium patterning. Bactrocera is unique in possessing oval shaped epandrium and an unpatterned praeputium. An analysis of phylogenetic relationships between three genera of the tribe Dacini from India based on morphological characters has been attempted for the first time. Cladistic analysis employing 51 characters of 62 species in Dacini, with seven species as outgroups revealed the monophyly of Dacini, Bactrocera and Dacus with supporting nonhomplasious synapomorphies. Ichneumonopsis Hardy, often included in the Gastrozonini, does not possess any synapomorphies of Dacini, eventhough it appeared at the base of the Dacini clade. Zeugodacus was retrieved as a monophyletic sister-group to Dacus based solely on a single homoplasious host plant character, with weak statistcal support. 

Larval Sphindidae (Coleoptera : Cucujoidea): phylogenetic implications and new descriptions

2000 ◽  
Vol 14 (6) ◽  
pp. 807 ◽  
Author(s):  
Erica Chiao ◽  
Joseph V. McHugh
Keyword(s):  
Cladistic Analysis ◽  
Sister Group ◽  
Sister Group Relationship ◽  
Data Sets ◽  
Strong Impact ◽  
Length Difference ◽  
Phylogenetic Implications ◽  
The Family ◽  
Cladistic Analyses ◽  
First Time

A new phylogenetic hypothesis of Sphindidae (Coleoptera: Cucujoidea) ispresented, based on a cladistic analysis of 15 larval morphology characters inaddition to 39 adult morphology characters modified from a previous study by McHugh (1993). Results from the combined cladistic analyses show larval characters supporting several previously established relationships and resolving the placement of Notosphindus McHugh & Wheeler. The sister-group relationship betweenCarinisphindus McHugh and SphindusMegerle in Dejean is not supported by the combined analyses. Larval charactersdid not show a disproportionately strong impact on the more basal nodes.Incongruence length difference analysis found an insignificant level ofdiscordance (P = 0.197) between the adult andlarval based data sets. Larval Notosphindus slateriMcHugh & Wheeler, Genisphindus minor McHugh andCarinisphindus purpuricephalus McHugh & Lewis aredescribed for the first time, representing the first larval descriptions forthese genera. A literature review of immature stages of sphindid beetles and ageneric level key to larvae of the family are provided.

Phylogenetic relationships, larval morphology, and chaetotaxy of the subfamily Coptotominae (Coleoptera: Dytiscidae)

2013 ◽  
Vol 145 (3) ◽  
pp. 247-264 ◽  
Author(s):  
Mariano C. Michat ◽  
Yves Alarie
Keyword(s):  
Phylogenetic Relationships ◽  
Abdominal Segment ◽  
Cladistic Analysis ◽  
Sister Group ◽  
Sister Group Relationship ◽  
Larval Morphology ◽  
First Instar ◽  
Segment Viii ◽  
Tracheal Gills

AbstractLarval morphology of the monogeneric subfamily Coptotominae (Coleoptera: Dytiscidae) is described and illustrated in detail, with particular emphasis on morphometry and chaetotaxy. Larvae ofCoptotomusSay are unique within Dytiscidae in the presence of tracheal gills on the abdominal segments I–VI, a short bifid horn or nasale in instar I, long spinulae on the urogomphus in instar I, and rows of natatory setae on both the internal and external margins of the urogomphus in instars II and III. A cladistic analysis based on 125 larval characters sampled among representatives of other dytiscid subfamilies supports a sister-group relationship between Coptotominae and Laccophilinae based on the shared absence of setae LA10 and LA12 on the second labial palpomere and of pore ABc on the abdominal segment VIII. The clade Coptotominae + Laccophilinae resolved as sister to Lancetinae, all three subfamilies sharing the presence of an unusually low number of lamellae clypeales in the first instar (a condition called four-peg-pattern), postulated to have evolved secondarily within Dytiscidae.

scholarly journals Phylogenetic relationship of catshark species of the genus Scyliorhinus (Chondrichthyes, Carcharhiniformes, Scyliorhinidae) based on comparative morphology

2020 ◽  
Vol 96 (2) ◽  
pp. 345-395
Author(s):  
Karla D. A. Soares ◽  
Marcelo R. de Carvalho
Keyword(s):  
Phylogenetic Relationships ◽  
Comparative Morphology ◽  
Sister Group ◽  
Morphological Characters ◽  
Data Matrix ◽  
The Family ◽  
Almost All ◽  
Relationship Of ◽  
First Time ◽  
Meristic Data

The genus Scyliorhinus is part of the family Scyliorhinidae, the most diverse family of sharks and of the subfamily Scyliorhininae along with Cephaloscyllium and Poroderma. This study reviews the phylogenetic relationships of species of Scyliorhinus in the subfamily Scyliorhininae. Specimens of all Scyliorhinus species were examined as well as specimens of four of the 18 species of Cephaloscyllium, two species of Poroderma, representatives of almost all other catshark (scyliorhinid) genera and one proscylliid (Proscyllium habereri). A detailed morphological study, including external and internal morphology, morphometry and meristic data, was performed. From this study, a total of 84 morphological characters were compiled into a data matrix. Parsimony analysis was employed to generate hypotheses of phylogenetic relationships using the TNT 1.1. Proscyllium habereri was used to root the cladogram. The phylogenetic analysis, based on implied weighting (k = 3; 300 replications and 100 trees saved per replication), resulted in three equally most parsimonious cladograms with 233 steps, with a CI of 0.37 and an RI of 0.69. The monophyly of the subfamily Scyliorhininae is supported as well as of the genus Scyliorhinus, which is proposed to be the sister group of Cephaloscyllium. The phylogenetic relationships amongst Scyliorhinus species are presented for the first time.

scholarly journals Morphology of the second zoeal stage of Grapsus adscensionis (Osbeck, 1765) (Crustacea, Decapoda, Grapsoidea) confirms larval characters of the family Grapsidae

Zootaxa ◽  
2012 ◽  
Vol 3540 (1) ◽  
pp. 59 ◽  
Author(s):  
JOSÉ MARÍA LANDEIRA ◽  
JOSÉ A. CUESTA
Keyword(s):  
Canary Islands ◽  
Phylogenetic Relationships ◽  
Zoeal Stage ◽  
Larval Morphology ◽  
Ne Atlantic ◽  
Gran Canaria ◽  
The Family ◽  
First Time

The morphology of the second zoeal stage of Grapsus adscensionis, hatched from ovigerous specimens collected in the supralittoral zone of Taliarte Harbour, Gran Canaria (Canary Islands, NE Atlantic), is described and illustrated in detail for the first time. The comparison of its larval morphology with those of other species of Grapsidae provides information for the characterization of the zoeal morphology of grapsids, with implications in the phylogenetic relationships within the family, as well as an aid in identification of plankton samples.

The phylogenetic position of Hydrovatus Motschulsky: evidence from larval morphology of H. caraibus Sharp (Coleoptera: Dytiscidae: Hydroporinae)

2006 ◽  
Vol 37 (4) ◽  
pp. 419-432 ◽  
Author(s):  
Mariano Michat
Keyword(s):  
Cladistic Analysis ◽  
Sister Group ◽  
Instar Larva ◽  
Phylogenetic Position ◽  
Sister Group Relationship ◽  
Larval Morphology ◽  
First Instar ◽  
Basal Half ◽  
Relationship Of ◽  
First Time

AbstractThe phylogenetic position of Hydrovatus Motschulsky was investigated based on a cladistic analysis of 18 hydroporine taxa and 69 characters from larval morphology. For this purpose, the three larval instars of H. caraibus Sharp were described and illustrated for the first time, emphasizing the morphometry and chaetotaxy. The resulting cladogram supported a sister-group relationship of the tribes Hydrovatini and Hyphydrini, based on three unambiguous synapomorphies: the absence of pore ANh, the proximal insertion of seta LA8, and the abdominal segment VI sclerotized ventrally. The strong development of seta AB5 and the absence of pore PAj are other two potential synapomorphies for this clade. The tribe Vatellini was resolved as more closely related to members of Hydroporini than to Hyphydrini. However, the support obtained for this relationship was weak, since no unambiguous synapomorphies were discovered. Larvae of H. caraibus are characteristic within Hydroporinae in the absence of an occipital suture, the presence of a galea (secondarily derived according to this study), and the absence of setae LA3 and UR8 and pores PAm and PAo. First instar larva is also unique in that the egg bursters are basally placed on the frontoclypeus and the claws bear ventral spinulae on basal half.

The first zoeal stage of the yellow land crab Johngarthia lagostoma (Milne Edwards, 1837) (Decapoda: Brachyura: Gecarcinidae)

Zootaxa ◽  
2021 ◽  
Vol 4990 (1) ◽  
pp. 192-200
Author(s):  
SIMONE MARIA DE ALBUQUERQUE LIRA ◽  
CYNTHIA DAYANNE MELLO DE LIMA ◽  
IGOR DE ÁVILA TEIXEIRA ◽  
RALF SCHWAMBORN
Keyword(s):  
Phylogenetic Relationships ◽  
Zoeal Stage ◽  
Dorsal Seta ◽  
Tropical Atlantic ◽  
Larval Morphology ◽  
Land Crab ◽  
The Family ◽  
Fernando De Noronha ◽  
Morphological Differences

The objective of this paper is to describe and illustrate the first zoeal stage of the largest land crab of the Tropical Atlantic, Johngarthia lagostoma (Milne Edwards, 1837) (Brachyura: Gecarcinidae). A larval description of J. lagostoma was previously not available. Larvae were obtained from ovigerous females on Rocas Atoll and Fernando de Noronha Archipelago, Brazil. Twenty larvae were randomly chosen to be dissected and described in detail, while 40 others (20 larvae from each island) were measured only. The published description of the congener J. planatus (Stimpson, 1860) larvae was used for a comparison of larval morphology. Some morphological differences between the first zoeal stage of these two species were: The absence or presence of a simple shorter seta on antennule, number of the minute terminal spines on the antenna, setation of the coxal endite of the maxilla, exopod unsegmented of the first and second maxilliped, and a single mid-dorsal seta on first pleonite. These results and differences observed between these species can assist in studies on phylogenetic relationships within the Family Gecarcinidae MacLeay, 1838, as well as in the identification of the larvae of J. Lagostoma in plankton samples from the tropical Atlantic.  

scholarly journals A fresh look at Cladarosymblema narrienense, a tetrapodomorph fish (Sarcopterygii: Megalichthyidae) from the Carboniferous of Australia, illuminated via X-ray tomography

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e12597
Author(s):  
Alice M. Clement ◽  
Richard Cloutier ◽  
Jing Lu ◽  
Egon Perilli ◽  
Anton Maksimenko ◽  
...  
Keyword(s):  
Original Description ◽  
Sister Group ◽  
Axial Skeleton ◽  
Phylogenetic Position ◽  
Micro Computed Tomography ◽  
Holotype Specimen ◽  
Freshwater Swamp ◽  
The Family ◽  
First Time ◽  
Detailed Work

Background The megalichthyids are one of several clades of extinct tetrapodomorph fish that lived throughout the Devonian–Permian periods. They are advanced “osteolepidid-grade” fishes that lived in freshwater swamp and lake environments, with some taxa growing to very large sizes. They bear cosmine-covered bones and a large premaxillary tusk that lies lingually to a row of small teeth. Diagnosis of the family remains controversial with various authors revising it several times in recent works. There are fewer than 10 genera known globally, and only one member definitively identified from Gondwana. Cladarosymblema narrienense Fox et al. 1995 was described from the Lower Carboniferous Raymond Formation in Queensland, Australia, on the basis of several well-preserved specimens. Despite this detailed work, several aspects of its anatomy remain undescribed. Methods Two especially well-preserved 3D fossils of Cladarosymblema narrienense, including the holotype specimen, are scanned using synchrotron or micro-computed tomography (µCT), and 3D modelled using specialist segmentation and visualisation software. New anatomical detail, in particular internal anatomy, is revealed for the first time in this taxon. A novel phylogenetic matrix, adapted from other recent work on tetrapodomorphs, is used to clarify the interrelationships of the megalichthyids and confirm the phylogenetic position of C. narrienense. Results Never before seen morphological details of the palate, hyoid arch, basibranchial skeleton, pectoral girdle and axial skeleton are revealed and described. Several additional features are confirmed or updated from the original description. Moreover, the first full, virtual cranial endocast of any tetrapodomorph fish is presented and described, giving insight into the early neural adaptations in this group. Phylogenetic analysis confirms the monophyly of the Megalichthyidae with seven genera included (Askerichthys, Cladarosymblema, Ectosteorhachis, Mahalalepis, Megalichthys, Palatinichthys, and Sengoerichthys). The position of the megalichthyids as sister group to canowindrids, crownward of “osteolepidids” (e.g.,Osteolepis and Gogonasus), but below “tristichopterids” such as Eusthenopteron is confirmed, but our findings suggest further work is required to resolve megalichthyid interrelationships.

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