Developmental changes in foregut functioning of packhorse lobster, Jasus (Sagmariasus) verreauxi (Decapoda:Palinuridae), phyllosoma larvae

2004 ◽  
Vol 55 (2) ◽  
pp. 145 ◽  
Author(s):  
Serena L. Cox ◽  
Danielle J. Johnston
Keyword(s):  
Larval Development ◽  
Video Analysis ◽  
Artificial Diet ◽  
Filter Press ◽  
Developmental Changes ◽  
Early Instar ◽  
Food Digestion ◽  
Dietary Shifts ◽  
Phyllosoma Larvae ◽  
Sagmariasus Verreauxi

The development of foregut structure and digestive function was examined in Jasus (Sagmariasus) verreauxi phyllosomas (instars 1–13) using resin histology and video analysis. Early instar (1–3) phyllosoma had very simple anterior foreguts with little differentiation into ventral and dorsal chambers, no filter press and small lateral comb-row setae. By mid instars (4–7), the filter press had developed and ventral and dorsal chambers of the foregut were distinct. The number and robustness of lateral setae had increased and a dense mat of anterior floor setae had formed. The filter press became increasingly complex in later-instar (8–13) larvae and dense robust lateral comb-row setae, main brushes and a thick mat of anterior floor setae forming longitudinal channels had developed by this stage. The mechanism of food digestion remained similar between instars but changes in foregut structures suggest that the degree of internal mastication, filtration and capacity to sort and mix particles improved with age. This research has implications for artificial diet development in crustacean culture and understanding dietary shifts during larval development.

Mouthpart and foregut ontogeny in phyllosoma larvae of the spiny lobster Jasus edwardsii (Decapoda: Palinuridae)

2001 ◽  
Vol 52 (8) ◽  
pp. 1375 ◽  
Author(s):  
Danielle J. Johnston ◽  
Arthur Ritar
Keyword(s):  
Larval Development ◽  
Early Stage ◽  
Structural Characteristics ◽  
Spiny Lobster ◽  
Filter Press ◽  
Primary Role ◽  
Formulated Diets ◽  
Jasus Edwardsii ◽  
Phyllosoma Larvae

Mouthpart and foregut structure indicates that Jasus edwardsii phyllosomas ingest soft fleshy foods such as gelatinous zooplankton. Mouthpart morphology changes little during larval development, indicating that ingestive capabilities and external mastication are well developed from an early age. However, the density and complexity of setation and robustness of individual mouthparts increases with age, suggesting a greater capacity to ingest larger prey during development. The foregut consists of a single chamber with a number of well-developed grooves, ridges, and setae but lacking a gastric mill. The primary role of the foregut is mixing, sorting, and filtering particles, preground by the mouthparts. Phyllosomas have been divided into early (stage I–III), mid (IV–V), and late (VI–X) stages based on the development of the filter press and main brushes. Increasing robustness of setation and complexity of the foregut suggest that the texture of prey becomes more muscular (fibrous) with larval development. The results presented here suggest that early-stage phyllosoma would benefit from a diet comprising soft gelatinous items, whereas late-stage phyllosomas are better prepared to deal with larger, fleshy prey. The changes in structural characteristics with age should also serve as a guide in the development of formulated diets.

scholarly journals Development and functional morphology of the larval foregut of two brachyuran species from Northern Brazil

2011 ◽  
Vol 83 (4) ◽  
pp. 1269-1278 ◽  
Author(s):  
Fernando A. Abrunhosa ◽  
Darlan J.B. Simith ◽  
Joely R.C. Monteiro ◽  
Antonio N. de Souza Junior ◽  
Pedro A.C. Oliva
Keyword(s):  
Larval Development ◽  
Feeding Behaviour ◽  
Food Source ◽  
Morphological Structure ◽  
Filter Press ◽  
Larval Feeding ◽  
Structural Development ◽  
Gastric Mill ◽  
Larval Stages ◽  
Northern Brazil

Feeding is an important factor for the successful rearing of larvae of the crab species. Further information on the morphological features of the foregut may to reveal larval feeding behaviour and or/whether there is a lecithotrophy in some or even in all stages of the larval cycle. In the present study, the structural development of the foregut and their digestive functions were examined in larvae of two brachyurans, Uca vocator and Panopeus occidentalis, reared in the laboratory. During larval development, the foreguts of the larvae in the first and last zoeal stages and in the megalopa stage were microscopically examined, described and illustrated. The zoeal foreguts of both species were well developed, showing specialization with a functional cardiopyloric valve and a filter press. The megalopa stage had a complex and specialized gastric mill similar to that found in adult crabs with the appearance of rigidly calcified structures. These results support the hypothesis that the feeding behaviour of each larval stage is directly related to the morphological structure of the foregut. Such facts strongly indicate that all larval stages of both . vocator and P occidentalis need an external food source before completing the larval development in a planktonic environment.

scholarly journals The morphology of the foregut of larvae and postlarva of Sesarma curacaoense De Man, 1892: a species with facultative lecithotrophy during larval development

2006 ◽  
Vol 36 (3) ◽  
pp. 375-380 ◽  
Author(s):  
Marlon Aguiar Melo ◽  
Fernando Abrunhosa ◽  
Iracilda Sampaio
Keyword(s):  
Fine Structure ◽  
Larval Development ◽  
Larval Stage ◽  
Filter Press ◽  
Gastric Mill ◽  
Juvenile Stages ◽  
De Man ◽  
Lecithotrophic Development

Previous study on the resistance of larvae of Sesarma curacaoense submitted to starvation has revealed a facultative lecithotrophy during zoeal stages, but megalopa and first juvenile stages are exclusively feeding stages. In the present study, the gross morphology and fine structure of the foregut of S. curacaoense were investigated during larval, megalopa and first juvenile stages. The foregut of the zoea I show specific setae and a filter press apparently functional. The foregut undergoes changes in the zoea II (last larval stage) with increment of setae number, mainly on the cardiopyloric valve and complexity of the filter press. After metamorphosis to megalopa stage the foregut become rather complex, with a gastric mill supporting a medial and two lateral teeth well-developed. The foregut of the first juvenile is more specialized compared to the previous stage, showing similar characteristics of the decapod adults. These results provide further evidence of facultative lecithotrophic development in the larvae of S. curacaoense.

scholarly journals Can metamorphosis survival during larval development in spiny lobster Sagmariasus verreauxi be improved through quantitative genetic inheritance?

BMC Genetics ◽  
2018 ◽  
Vol 19 (1) ◽  
Author(s):  
Nguyen H. Nguyen ◽  
Quinn P. Fitzgibbon ◽  
Jane Quinn ◽  
Greg Smith ◽  
Stephen Battaglene ◽  
...  
Keyword(s):  
Larval Development ◽  
Spiny Lobster ◽  
Genetic Inheritance ◽  
Quantitative Genetic ◽  
Sagmariasus Verreauxi

scholarly journals Effect of plant protection products on Rhynchophorus palmarum L. (Coleoptera: Curculionidae) larvae in laboratory

2018 ◽  
Vol 85 (0) ◽  
Author(s):  
Samara dos Santos ◽  
Valdemir Albuquerque da Silva Júnior ◽  
Sonia Maria Forti Broglio ◽  
Aldomario Santo Negrisoli Junior ◽  
Elio Cesar Guzzo
Keyword(s):  
Analysis Of Variance ◽  
Artificial Diet ◽  
Plant Protection ◽  
Larval Mortality ◽  
Plant Protection Products ◽  
Fungal Diseases ◽  
Laboratory Conditions ◽  
Rhynchophorus Palmarum ◽  
Early Instar

ABSTRACT: With the aim of developing tools for simultaneously managing Rhynchophorus palmarum and the coconut stem bleeding disease, we evaluated the effects of the insecticide thiamethoxam and the fungicide cyproconazole on R. palmarum larvae under laboratory conditions. Early-instar and intermediate-instar larvae were fed on an artificial diet containing 0.1% concentration of insecticide, fungicide or a mixture of both. Larval mortality was assessed daily during the 48 hours after the application of the treatments. Mean mortality values were subjected to analysis of variance and compared by Tukey’s test (p ≤ 0.05). Thiamethoxam caused mortality of 100% of early-instar and 90% of intermediate-instar larvae. In contrast, mortality was significantly lower in the cyproconazole treatment (60% for early-instar and 0% for intermediate-instar larvae) and the control (0% mortality for both treatments). The insecticide/fungicide mixture was equally effective (100% for early-instar and 86.67% for intermediate-instar larvae) to the insecticide only treatment. Differences in mortality between early-instar and intermediate-instar larvae were significant only for the thiamethoxam and cyproconazole treatments. These results indicate that, for the doses used here, thiamethoxam is toxic to both early-instar and intermediate-instar larvae, while cyproconazole is toxic just to early-instar larvae. Moreover, cyproconazole does not increase the toxicity of thiamethoxam. Early-instar larvae are more sensitive to thiamethoxam and cyproconazole than intermediate-instar larvae. We conclude that thiamethoxam + cyproconazole mixture may be effective for managing R. palmarum and associated fungal diseases on coconut palms.

scholarly journals Midgut Protease Activity During Larval Development of Anastrepha obliqua (Diptera: Tephritidae) Fed With Natural and Artificial Diet

2017 ◽  
Vol 17 (6) ◽  
Author(s):  
José Pedro Rivera-Ciprian ◽  
Marysol Aceituno-Medina ◽  
Karina Guillen ◽  
Emilio Hernández ◽  
Jorge Toledo
Keyword(s):  
Larval Development ◽  
Protease Activity ◽  
Artificial Diet ◽  
Anastrepha Obliqua

Distribution of phyllosoma larvae of Scyllaridae and Palinuridae (Decapoda : Palinuridea) in the south-western lagoon of New Caledonia

2000 ◽  
Vol 51 (4) ◽  
pp. 363 ◽  
Author(s):  
Emmanuel Coutures
Keyword(s):  
Larval Development ◽  
New Caledonia ◽  
Coastal Areas ◽  
The Other ◽  
Stage I ◽  
Barrier Reef ◽  
The South ◽  
Outer Slope ◽  
South West ◽  
Phyllosoma Larvae

Densities of phyllosomata of Panulirus, Scyllarides, Parribacus and Scyllarus were measured by plankton sampling in November–December 1996 and 1997 in the lagoon, in a passage through the barrier reef and above the outer slope to the south-west of New Caledonia. A total of 1017 phyllosomata were caught: 584 Panulirus, 66 Scyllarides, 6 Parribacus and 361 Scyllarus. More phyllosomata of Scyllarus spp. were caught in the lagoon than at the other two sites. The larval development of certain Scyllarus species can occur entirely in the lagoon, but morphology of the early stages of the four Scyllarus species caught here was too similar to permit conclusions about specific strategies. Phyllosomata of the Panulirus spp., Scyllarides spp. and Parribacus spp. develop only in the ocean. High densities of Stage I of Panulirus ornatus larvae caught in the passage and nearby ocean suggested that the reproductive adults of this species migrate from coastal areas towards more oceanic areas to hatch their phyllosomata. Stage I phyllosomata of Panulirus and Scyllarides were near the surface and would be carried quickly from the lagoon by the current, whereas this behaviour was not shown for Stage I phyllosomata of Scyllarus sp., and this would probably limit their passive wind drifting.

Effects of temperature on instar number and larval development in the endangered longhorn beetle Callipogon relictus (Coleoptera: Cerambycidae) raised on an artificial diet

2019 ◽  
Vol 151 (04) ◽  
pp. 537-544
Author(s):  
Dae-Am Yi ◽  
Alexander V. Kuprin ◽  
Yeon Jae Bae
Keyword(s):  
Relative Humidity ◽  
Larval Development ◽  
Artificial Diet ◽  
Rapid Development ◽  
Experimental Information ◽  
Effect Of Temperature ◽  
South Korean Government ◽  
South Korean ◽  
Longhorn Beetle ◽  
Canadian Food Inspection Agency

Abstract Callipogon relictus Semenov (Coleoptera: Cerambycidae) is currently listed in the Red Data Books (Category I) of Russia and South Korea and, in 2006, was designated by the South Korean government as the first invertebrate priority target species in a restoration project. However, the species is also classified as an invasive quarantine pest by the Canadian Food Inspection Agency. Due to the five-year to seven-year life cycle of the species, experimental information about instar numbers has been poorly documented. Therefore, the goal of the present study was to document the instar numbers of non-diapause Callipogon relictus larvae reared on an artificial diet. Under conditions of 30 °C, 60% relative humidity, and constant dark (0:24 hour light-dark photoperiod), developmental pathways of 8, 10, and 12 instars were observed. The effect of temperature (20, 25, and 30 °C) on the duration of larval development was also examined to identify the optimum temperature for producing Callipogon relictus for conservational purposes. Larvae reared at 30 °C and 60% relative humidity, without a chill period, developed in seven to eight months, which is about one-tenth the duration of C. relictus development under natural conditions and the most rapid development of C. relictus observed to date.

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