Carcinonemertes regicides n.sp. (Nemertea), a symbiotic egg predator from the red king crab, Paralithodes camtschatica (Decapoda: Anomura), in Alaska

1989 ◽  
Vol 67 (4) ◽  
pp. 923-930 ◽  
Author(s):  
Jeffrey D. Shields ◽  
Daniel E. Wickham ◽  
Armand M. Kuris
Keyword(s):  
New Species ◽  
Decapod Crustacean ◽  
Red King Crab ◽  
Symbiotic Relationship ◽  
Adult Size ◽  
King Crab ◽  
Flame Cell ◽  
Cell Pattern ◽  
The Family ◽  
Paralithodes Camtschatica

A symbiotic nemertean worm, Carcinonemertes regicides n.sp., found on red king crabs, Paralithodes camtschatica, is described and compared with other members of the genus Carcinonemertes. The family Carcinonemertidae Humes, 1942 is emended to include this species and to include known but as yet undescribed members. The following familial characters are considered diagnostic: (i) symbiotic relationship with a decapod crustacean, (ii) short proboscis, (iii) absence of cerebral organs, (iv) presence of Takakura's duct, and (v) a hoplonemertean larva. The new species of Carcinonemertes has a relatively large basis and stylet, a large anterior proboscis chamber, and a newly described flame cell pattern of 2[(1 + 1 + 1 + 1)]. In addition, at maturity it is the smallest member of the genus (typical adult size is 2.0 mm in length), and female worms bear ovarian pores before oviposition. The above characters distinguish this species from others in the genus.

Upogebiidae Borradaile, 1903 from the Andaman Sea, collected by the Phuket Marine Biological Center, Thailand, with seven new species, presented in revised keys (Thalassinidea Latreille, 1831)

Crustaceana ◽  
2015 ◽  
Vol 88 (5) ◽  
pp. 577-609
Author(s):  
Katsushi Sakai
Keyword(s):  
New Species ◽  
International Workshop ◽  
Decapod Crustacean ◽  
Andaman Sea ◽  
Marine Biological ◽  
Special Publication ◽  
The Family ◽  
Two New Species

A biodiversity workshop under the title “International Workshop on the Crustacea of the Andaman Sea” was held at Phuket Marine Biological Center (PMBC), Phuket, Thailand, from 29 November to 20 December 1998 in the framework of the Thai-Danish BIOSHELF programme, running from 1996 to 2000. Material of the decapod crustacean families Callianassidae Dana, 1852 and Upogebiidae Borradaile, 1903, collected in 1996 and 1998, has been made available for study. As a sequel to the report on the callianassid collections, published in 2002 (Phuket Marine Biological Center Special Publication,23(2): 461-532 [2002]), the upogebiid collections, are treated in the present paper, with as a result records of seven species of the genusParagebiculaSakai, 2006, including five new species, and three species of the genusUpogebiaLeach, 1814, including two new species. All species are presented in revised keys to the subfamilies, genera, and species of the family Upogebiidae Borradaile, 1903.

Miroblatta baai, a new very large cockroach species from caves of Borneo (Blattaria: Blaberidae)

Zootaxa ◽  
2007 ◽  
Vol 1390 (1) ◽  
pp. 21 ◽  
Author(s):  
PHILIPPE GRANDCOLAS ◽  
LOUIS DEHARVENG
Keyword(s):  
New Species ◽  
River System ◽  
Morphological Evidence ◽  
Adult Size ◽  
Genital Morphology ◽  
East Kalimantan ◽  
The Family ◽  
Underground River ◽  
A New Species

A new species of the genus Miroblatta Shelford, 1906 is described from caves of Borneo in East Kalimantan, Indonesia. This new species, M. baai sp. nov., is similar to the epigean species M. petrophila Shelford, 1906 also found in Borneo. It differs by a larger adult size, longer legs, shorter wings, longer pronotum showing a remarkable central bulbous structure, lighter colouration and genital morphology (especially sclerite L1 shape). The genital morphology as well as morphological evidence for ovoviviparity confirm that the genus belongs to the family Blaberidae, subfamily Epilamprinae. Contrary to its epigean relative M. petrophila, this new species has been found exclusively in karstic caves of the same underground river system and these occurrences as well as the elongated legs and reduced eyes allow one to assume that this is a truly troglobitic species, so far the first one recorded in the family Blaberidae.

Infestation by Brood Symbionts and Their Impact on Egg Mortality of the Red King Crab, Paralithodes camtschatica, in Alaska: Geographic and Temporal Variation

1991 ◽  
Vol 48 (4) ◽  
pp. 559-568 ◽  
Author(s):  
Armand M. Kuris ◽  
S. Forrest Blau ◽  
A. J. Paul ◽  
Jeffrey D. Shields ◽  
Daniel E. Wickham
Keyword(s):  
Life History ◽  
Life Cycle ◽  
Temporal Variation ◽  
Seasonal Pattern ◽  
Red King Crab ◽  
King Crab ◽  
Egg Masses ◽  
Egg Mortality ◽  
Paralithodes Camtschatica

Egg masses of 772 red king crab, Paralithodes camtschatica, were sampled to determine the prevalence, intensity, and patterns of cooccurrence of brood symbionts from 28 Alaskan localities. Carcinonemertes regicides and three other undescribed nemertean egg predators were recovered from many localities, as were an undescribed turbellarian and an amphipod, Ischyrocerus sp. A widespread outbreak of nemerteans occurred in the 1983–84 and 1984–85 red king crab brooding seasons. At some locations, nearly all of the eggs were consumed in the 1983–84 brood season. Feeding of C. regicides on eggs was documented in vitro and these worms caused substantial egg mortality at many locations. The amphipod was also an egg predator and may have had a significant impact at three locations. The turbellarian did not kill eggs. From the seasonal pattern of C. regicides infestation at Kachemak Bay, we postulate an abbreviated life cycle and autoinfection for C. regicides. Such life history features may have contributed to the peak intensities observed late in the 1983–84 and 1984–85 brooding seasons. At some localities, heavy brood mortality may reduce or eliminate recruitment of some year classes to the fishery.

Behavioral Ecology of Podding Red King Crab, Paralithodes camtschatica

1990 ◽  
Vol 47 (10) ◽  
pp. 1944-1958 ◽  
Author(s):  
C. Braxton Dew
Keyword(s):  
Behavioral Ecology ◽  
Diel Activity ◽  
Red King Crab ◽  
Probability Models ◽  
Sea Stars ◽  
Homing Behavior ◽  
King Crab ◽  
Frequency Distributions ◽  
Nocturnal Foraging ◽  
Paralithodes Camtschatica

Diel activity cycles and foraging dynamics for two pods of 500–800 juvenile red king crab, Paralithodes camtschatica, were monitored for 196 d. (Nov. 1987–June 1988) and 148 d. (Oct. 1988–Feb. 1989) in Womans Bay, Kodiak, Alaska, using SCUBA. Nocturnal foraging and homing behavior of podding red king crab were documented for the first time. Variation in time of pod dispersal into a nightly foraging aggregation was explained (R2 = 0.72) by changes in water temperature, crab weight, and time of sunset. A trend of increased foraging time and movement to deeper, cooler water was apparent after mid-April, as water temperatures reached 4 °C and began a sustained summer increase. Molting occurred only at night, and seasonal variations in molting rate were estimated using molting probability models based on length-frequency distributions. Average pod movement was counter to the direction of strongest water currents, and homing behavior suggested some affinity for a low-light environment in man-made niches. Items most frequently eaten were sea stars (Evasterias troschelii) and macrophytes (Laminaria sp. and Ulva sp.). I discuss the inception of podding as a discontinuity in behavior, perhaps reflecting a break in the fractal continuum of niche availability within red king crab habitat.

Temperature-Dependent Growth of Juvenile Red King Crab (Paralithodes camtschatica) and its Effects on Size-at-Age and Subsequent Recruitment in the Eastern Bering Sea

1990 ◽  
Vol 47 (7) ◽  
pp. 1307-1317 ◽  
Author(s):  
Bradley G. Stevens
Keyword(s):  
Bering Sea ◽  
Published Data ◽  
Red King Crab ◽  
Sea Temperature ◽  
King Crab ◽  
Recruitment Failure ◽  
Eastern Bering Sea ◽  
Paralithodes Camtschatica ◽  
Size Interval ◽  
Size At Age

A temperature-based growth relationship was derived for juvenile red king crab (Paralithodes camtschatica) from published data. Growth of annual cohorts of crab was simulated at various locations in Bristol Bay, AK, using long-term water temperature observations, and the resulting mean sizes were compared with those observed by the annual National Marine Fisheries Service eastern Bering Sea crab survey. Results indicate that mean age-at-recruitment is 3–5 yr greater than previously estimated, and has decreased from 9.5 to 7.5 yr over the past decade as a result of increasing sea temperature. Single year-classes require 3–5 yr for complete recruitment to the 'mature' size interval, and recruitment in any year may consist of crabs from four to five year-classes. The high landings and subsequent crash of the Bering Sea red king crab population during the late 1970's probably originated from one or more adjacent strong year-classes in the late 1960's which recruited over a period of several years, followed by a period of recruitment failure and high mortality. Future stock–recruitment studies should account for the effects of multi-year recruitment and year-class overlap.

scholarly journals Two unusual new species of Caleremaeus (Acari: Oribatida) from eastern North America, with redescription of C. retractus and reevaluation of the genus

Acarologia ◽  
2020 ◽  
Vol 60 (2) ◽  
pp. 398-448
Author(s):  
Roy A. Norton ◽  
Valerie M. Behan-Pelletier
Keyword(s):  
New Species ◽  
Oribatid Mite ◽  
Adult Size ◽  
Transverse Ridge ◽  
Fossil Species ◽  
The North ◽  
Extant Species ◽  
The Family ◽  
Eastern Usa

The oribatid mite genus Caleremaeus (Caleremaeidae) is widely distributed in the northern hemisphere but has been represented by only three extant and one fossil species. We redescribe the North American C. retractus (Banks, 1947) based on adults and nymphs; it is distinguishable from the European type species, C. monilipes (Michael, 1882) by its smaller adult size and minor differences in cuticular structure, and by the elongated, tapered form of seta h1 in nymphs. Two new species are proposed: C. nasutus n. sp. from forest soil in Alabama is unique in having adults with a large anterior rostral lobe (juveniles unknown) bearing lamellar setae; the arboreal C. arboricolus n. sp. from eastern USA and Canada is unique among described extant species in having adults with femoral saccules, a transverse ridge bearing lamellar setae and relatively large notogastral setae, and juveniles with a bothridial seta similar to that of the adult. Based on all available data, Caleremaeus is redescribed and considered the sole genus in Caleremaeidae. The higher classification of the family is reviewed, and past placement in Ameroidea is rejected in favor of the monofamilial Caleremaeoidea.

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