Excorallana bicornis

Souza-Filho, Elinai dos Santos Silva Jesser F., 2017, Species of Excorallana (Isopoda, Corallanidae) from northern and northeastern Brazil, with description of a new species, Excorallana lemoscastroi sp. nov., Nauplius (e 2017026) 25, pp. 1-21 : 2-4

publication ID	https://doi.org/10.1590/2358-2936e2017026
persistent identifier	https://treatment.plazi.org/id/F11287A4-8D0A-FFFC-FBA4-4F5DFAD0F6B6
treatment provided by	Felipe
scientific name	Excorallana bicornis
status

Treatment

Lemos de Castro & Lima, 1971

( Figs. 1 View Figure 1 , 2 View Figure 2 )

Excorallana bicornis Lemos de Castro and Lima, 1971: 136 View in CoL , figs. 1–14. – Pires-Vanin, 1998: 611.

Material examined. 1 adult male ( MOUFPE 15.138 View Materials ), AS #2017, Amapá, 3º56’00”N 50º00’07”W, 81 m depth GoogleMaps . 1 adult male, 5 females (2 adults and 3 ovigerous), 34 juveniles (undefined sex) ( MOUFPE 976 View Materials ), GM 189, Amapá, 3°50’00”N 49°55’0”W, 69 m depth GoogleMaps . 1 adult male and 1 adult female ( MOUFPE 873 View Materials ), GM 22, Pará, 00°00’00”N 45°37’00”W, 65 m depth GoogleMaps . 3 males (2 adults and 1 juvenile), 32 females (23 adults, 8 juveniles, 1 ovigerous) ( MOUFPE 876 View Materials ), GM 28, Pará , 00º20’00”N 46º03’05”W, 51 m depth GoogleMaps . 2 adult males ( MOUFPE 874 View Materials ), AS # 1729, Ceará, 2º10’30”S 41º27’00”W, 82 m depth GoogleMaps . 1 adult male, 1 adult female ( MOUFPE 872 View Materials ), AS # 1731 A, Ceará, 2º30’00”S 41º51”00”W, 25 m depth . 2 adult males, 5 females (1 adult, 1 ovigerous, 3 juveniles) ( MOUFPE 871 View Materials ), AS 1773A, Ceará , 2º40’30”N 48º03”W, 103 m depth . 4 adult males, 12 females (11 adults, 1 juvenile) ( MOUFPE 870 View Materials ), PB# 32 II, Paraíba , 7º39’30”S 034°47’30”W, 76 m depth GoogleMaps . 1 adult female ( MOUFPE 869 View Materials ), Recife 108, Pernambuco, 7º59’00”S 34º43’07”W, 29 m depth GoogleMaps . 1 adult male ( MOUFPE 875 View Materials ), Candeias PE, Pernambuco, 08°06’46”S 35°00’53”W GoogleMaps .

Diagnosis [modified from Lemos de Castro and Lima (1971)]. Body approximately 3x as long as wide. Head with medium sized eyes, distinctly separated, with two dorsal tubercles situated between eyes. Frontal lamina 2.5x longer than wide, lateral margins almost parallel, apex rounded ( Fig. 17 View Figure 17 ). Antennular peduncle with article 1 not dilated. Antenna reaching pereonite 3. Pereonite 1 with two dorsal tubercles more developed than head, near anterior margin. Pleonites with longitudinal lines of small tubercles and deep median longitudinal groove. Pleotelson triangular with lateral incisions and four tubercles on anterior margin. Uropods and pleotelson margins heavily coated with long setae.

Remarks. This species has marked sexual dimorphism. Important variations were found in the material examined. According to Lemos de Castro and Lima (1971), males have two tubercles on the head and two on the pereonite 1, while the female is devoid of tubercles. However, similarly to males, some females examined had two tubercles on the head and two on the pereonite 1, but less developed (females showing male characteristics: MOUFPE 876 – 9 females, MOUFPE 871 – 2 females, MOUFPE 976 – 5 females). Furthermore, according to Lemos de Castro and Lima (1971), males have more tubercles on the pleon than the females, but the same female specimens cited above had tubercles, as in the males ( Fig. 1 View Figure 1 ).

Geographic distribution. Brazil: Amapá, Pará, Ceará, Paraíba, Pernambuco ( Lemos de Castro e Brasil Lima, 1971; Pires-Vanin, 1998; this study) ( Fig. 2 View Figure 2 ) .