Scientia Marina, Vol 68, No 3 (2004)

Abbreviated larval development of Tunicotheres moseri (Rathbun, 1918) (Decapoda, Pinnotheridae), a rare case of parental care in brachyuran crabs


https://doi.org/10.3989/scimar.2004.68n3373

Juan Bolaños
Laboratory of Carcinology, Universidad de Oriente, Venezuela, Bolivarian Republic of

José A. Cuesta
Instituto de Ciencias Marinas de Andalucía (CSIC), Spain

Gonzalo Hernández
Laboratory of Carcinology, Universidad de Oriente, Venezuela, Bolivarian Republic of

Jesús Hernández
Laboratory of Carcinology, Universidad de Oriente, Venezuela, Bolivarian Republic of

Darryl L. Felder
Department of Biology, Laboratory for Crustacean Research, University of Louisiana at Lafayette, United States

Abstract


Tunicotheres moseri (Rathbun, 1918) presents a rare case of post-hatching parental care not recorded previously among brachyuran decapods. The complete larval development takes place within a brooding enclosure of the parental female, formed by flexure of the broad abdomen against the sternum. The first crab instar is the earliest stage observed to leave this enclosure, doing so without active help from the parental female. The development of stages preceding the first crab was investigated by in vitro culture of eggs obtained from ovigerous crabs inhabiting the atrial cavity of the tunicate Phallusianigra Savigny, 1816, in Venezuela. Eggs were hatched in the laboratory and reared through two zoeal stages and the megalopa. Additional samples of the larval stages were obtained directly from abdominal enclosures of aquarium-held females. All larval stages were described and illustrated in detail. Morphological comparisons were made between larvae from two different populations. Comparisons were also made with other previously described larvae of Pinnotherinae, which led us to conclude that Tunicotheres should not be assigned to the Pinnotherinae sensu stricto. Relationships between the three known disjunct populations assigned to T.moseri remain questionable, especially since the potential for larval dispersal appears to be very limited.

Keywords


Tunicotheres moseri; Pinnotheridae; larval morphology; parental care; zoea; megalopa; population; systematics

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