Eucalliacidae Manning and Felder, 1991

Poore, Gary C. B., Dworschak, Peter C., Robles, Rafael, Mantelatto, Fernando L. & Felder, Darryl L., 2019, A new classification of Callianassidae and related families (Crustacea: Decapoda: Axiidea) derived from a molecular phylogeny with morphological support, Memoirs of Museum Victoria (Mem. Mus. Vic.) 78, pp. 73-146 : 75

Eucalliacidae Manning and Felder, 1991 ......................... 122

Key to genera of Eucalliacidae ........................................ 125 Andamancalliax Sakai, 2011 ......................................... 126 Calliax de Saint Laurent, 1973 ...................................... 126 Calliaxina Ngoc-Ho, 2003............................................ 126 Eucalliax Manning and Felder, 1991 ............................. 127 Eucalliaxiopsis Sakai, 2011 ........................................... 127 Paraglypturus Türkay and Sakai, 1995 ......................... 128 Pseudocalliax Sakai, 2011 ............................................. 128

Paracalliacidae Sakai, 2005 ............................................. 128 Paracalliax de Saint Laurent, 1979 ............................... 129

Acknowledgements .......................................................... 129

References ........................................................................ 130

Introduction

The earliest published descriptions of callianassids were at the end of the 18th century and the beginning of the 19th century (fig. 1). The genus name Callianassa Leach, 1814 , was introduced shortly thereafter. The number of available species names now totals 305, with 262 accepted by WoRMS (2019) at the time of writing, twice that number if fossils are included. However, despite 72 more generic names having been erected over the last 200 years, authors remain undecided about the generic affinities of new species and Callianassa continues to be used as a catch-all genus. The affinities of many species have changed over time, some often, such that about 940 generic recombinations now exist ( Sakai, 2011, and later papers), which is more than three times the number of accepted species.

The unsatisfactory state of ghost shrimp systematics has been recently outlined by us in a linked study on which this paper depends (Robles et al., in press). Here, we present a classification of the family and genera of Callianassidae and related families based on Robles et al.’s (in press) phylograms that were derived by multigene analysis of two mitochondrial (16S, 12S) and two nuclear (histone 3, 18S) markers from 123 named species, one half of all extant described species (265 species; WoRMS, 2019), including 24 as yet undescribed or not confidently identified to species. The present phylogeny was supported by a parsimonious analysis of morphological data from 195 species that recovered terminal clades compatible with those of the genetic analyses, though not always with the same deep relationships between terminal taxa. Fitting the morphological data to the molecular phylogram discovered characters that could be viewed as synapomorphies of terminal clades that we treated as families and genera.

As in Robles et al. (in press), we use “callianassoid” as a short-hand term to refer to a monophyletic group of taxa that includes Ctenochelidae and Callianassidae (sensu Dworschak et al., 2012; Poore et al., 2014) in a well-supported clade found in the most recent molecular treatment of “ Thalassinidea ” ( Robles et al., 2009) and subclades Eucalliacinae , Ctenochelidae and Callianassidae ( Callichirinae and Callianassinae ) in another molecular treatment of Callianassidae and related families ( Felder and Robles, 2009). The complex taxonomy of Callianassoidea is explained below.

Here, seven callianassoid families of Axiidea and their genera are diagnosed. For diagnoses of the other families, see Sakai (2011) for Axiidae and Strahlaxiidae , see Poore (2015a) for Callianideidae , and see Poore and Collins (2015) for Micheleidae . A key to all families of Axiidea and keys to all callianassoid genera within the seven families are offered. Tables 1 and 2 list all 265 accepted species, synonyms excepted, alphabetically by species and by family and genus, respectively. One third of all species, 87, are in new combinations. Species authorities are given in these tables and are not repeated for the species mentioned by name in this text.