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Tumidotheres, a New Genus for Pinnotheres margarita Smith, 1869, and Pinnotheres maculatus Say, 1818 (Brachyura: Pinnotheridae)

Ernesto Campos
Journal of Crustacean Biology
Vol. 9, No. 4 (Nov., 1989), pp. 672-679
Published by: on behalf of The Crustacean Society
DOI: 10.2307/1548597
Stable URL: http://www.jstor.org/stable/1548597
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Tumidotheres, a New Genus for Pinnotheres margarita Smith, 1869, and Pinnotheres maculatus Say, 1818 (Brachyura: Pinnotheridae)
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Abstract

The genus Tumidotheres is erected to receive its type species Pinnotheres margarita Smith, 1869, from the East Pacific, and P. maculatus Say, 1818, from the West Atlantic. It differs from other pinnotherid genera principally in 3 features: (1) the gastric and cardiac regions are separated from the branchiohepatic area by depressions, all these regions tumid; (2) the palp of the third maxilliped is composed of 3 articles, with the carpus shorter than the spatulate propodus, the dactylus narrowly spatulate, inserted medially on the propodal inner margin and not overreaching the tip of this latter article; and (3) male and female abdomen composed of 7 free abdominal somites. An analysis of morphology of several postplanktonic stages of T. (formerly Pinnotheres) margarita suggested that this species should be considered as a senior synonym of P. pubescens (Holmes, 1894), which apparently was described from a hard-stage female. In addition, the life history, phylogenetic relationships, and larval morphology of Tumidotheres are discussed. /// Un nuevo género de cangrejo pinotérido, Tumidotheres, genus novum, es nombrado para recibir a su especie tipo, Pinnotheres margarita Smith, 1869, del Pacífico oriental, y P. maculatus Say, 1818, del Atlántico occidental. Morfologicamente este género difiere de otros asignados a Pinnotheridae en tres características principales: (1) la región cardíaca y la gástrica están separadas del área branquio-hepática por depresiones, siendo todas estas regiones del caparazón túmidas; (2) el palpo del tercer maxilipedio está formado por tres artejos, el carpus más corto que el espatulado propodus y el dactilus, el cual es angostamente espatulado, está inserto en la región media del propodus y su extremo distal no sobrepasa la punta de éste último artejo; y (3) el abdomen del macho y de la hembra están compuesto por siete somitos libremente articulados. Adicionalmente se reconoce que Pinnotheres pubescens (Holmes, 1894) fue descrito en base a una hembra en fase dura de T. (ex Pinnotheres) margarita (Smith, 1869) la cual por haber sido descrita primero debe considerarse un sinónimo antiguo y el nombre válido para esta singular especie. Comentarios adicionales sobre el ciclo de vida, relaciones filogenéticas y morfología larval se discuten para Tumidotheres y géneros emparentados.

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