Sicyonella Borradaile 1910
Creators: name: Vereshchaka, Alexander L.
name: Lunina, Anastasia A.
name: Olesen, Jørgen
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Sergestidae
Sicyonella

description: SICYONELLA BORRADAILE, 1910   
 Diagnosis: Carapace and abdomen smooth, firm; labrum not much separated from antennae and eyes; rostrum acute with oblique frontal margin and two dorsal teeth; supraorbital, pterygostomial, and hepatic teeth present; sixth abdominal somite and telson in males without ventral processes; telson with four pairs of lateral spines; eyestalks not elongated, cornea well pigmented; third antennular segment without ventral processes, shorter than first segment; stylocerite present, mobile; mandible with palp; maxillula in adults with two endites; first maxilliped with three-segmented exopod and epipod; second maxilliped with epipod; third maxilliped > two times as long as first pereopod, not dimorphic sexually, dactyl four-segmented; first pereopod with ischium lacking strong movable spines and normally developed chela, fingers subequal; second pereopod with merus lacking proximal protrusion and reduced chela lacking elongated setae, fingers subequal; third pereopod with reduced chela lacking strong curved spines and elongated setae, fingers subequal; pereopods IV–V progressively decreasing in length, flat, seven-segmented, carpi and meri setose only on one margin; uropodal exopod setose at distal part 1/5 of outer margin, with small tooth by far not reaching distal end of exopod. Male clasping organ: well developed, without clasping tubercle, bearing two contiguous rows of strong sensory setae or numerous scales. Petasma: pars astringens present, pars media developed, armed with pincers; processus uncifer developed, laminar, lacking hook. Photophores: dermal organs and organ of Pesta absent. Branchiae: podobranch on somite VIII, dendritic anterior arthrobranchs on somites IX–XIII, rudimentary posterior arthrobranchs on somites IX–XII, and dendritic posterior arthrobranchs on somite XIII.   
 Type species: By monotypy, Sicyonella maldivensis Borradaile, 1910.   
 Species: Sicyonella antennata Hansen, 1919, Sicyonella inermis (Paul’son, 1875), Sicyonella maldivensis Borradaile, 1910.   
 Remarks: Paul’son (1875) described a new species Aphareus inermis from the Red Sea in Russian and referred it to the family Penaeidae. Later Borradaile (1910) established a new genus Sicyonella for a new species, S. maldivensis, and, being ignorant of the Russian paper by Paul’son, was unaware that Sicyonella was identical to Aphareus Paul’son, 1875. Borradaile (1910) established a new subfamily Sicyoninae of the family Penaeidae. Calman (1913) discovered that the generic name Aphareus had been preoccupied by Cuvier (1830) for a fish and so proposed a new name Aphareocaris, also being unaware that this genus was identical to Sicyonella Borradaile, 1910. Hansen (1919) synonymized Aphareocaris with Sicyonella and described the latest valid species, S. antennata.   
 The excellent redescription of all valid species of Sicyonella by Fukuoka et al. (2005) with the use of SEM makes morphological comments redundant. Here we present a key to species as one was not provided in Fukuoka et al. (2005). Citations to illustrations that supplement the key are also given.
description: Published as part of Vereshchaka, Alexander L., Lunina, Anastasia A. & Olesen, Jørgen, 2016, Phylogeny and classification of the shrimp genera Acetes, Peisos, and Sicyonella (Sergestidae: Crustacea: Decapoda), pp. 353-377 in Zoological Journal of the Linnean Society 177 (2) on pages 357-358, DOI: 10.1111/zoj.12371, http://zenodo.org/record/5364660