Typhlotanais messinensis : G. O. Sars 1882
Creators: name: Błażewicz-Paszkowycz, Magdalena
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Tanaidacea
Typhlotanaidae
Typhlotanais
Typhlotanais messinensis

description: Typhlotanais messinensis G.O. Sars 1882   (Figs. 58–60)  
 Typhlotanais messinensis: G.O. Sars (1882a) 7: 39–40; Carus (1885) 1(2): 431; Norman & Stebbing (1886) 12: 109; G.O. Sars (1886) 11: 346–349; G.O. Sars, (1896): 18; Dollfus (1898) 11: 36; Norman (1899) 3: 340; Nierstrasz (1913) 32 (a): 34; Lang (1970) 23 (4): 274–275, 288; Larsen (2005): 209.   
 Material examined: CRU 3896, Messina 1-20/5.   
 Diagnosis: Antennule shorter than carapace; article-2 0.3 times as long as article-3. Antenna article-4 four times as long as wide. Cheliped carpus 2.5 times as long as wide wide. Pereopod-2-3 merus with short setae (shorter than half of carpus); propodus with spiniform seta ventrally; uropod rami two-articled.   
 Complementary description: Female 4.6 mm (Fig. 58A,B), body long, 7.1 times as long as wide; carapace smooth, 1.3 times as long as wide, lateral margins slightly rounded; rostrum slightly pointed; pereonites smooth, all wider than long; pereonite-1 shortest, almost twice as wide as long, half as long as pereonite-3; pereonites 2, 4 and 5 subequal, 1.5 times as long as pereonite-1; pereonite-3 longest; pereonite-6 0.6 times as long as pereonite-5. Pleon 1.5 times as long as carapace, pleonites 1–5 similar in size; pleotelson rounded.   
Antennule (Fig. 59A): Article-1 slender, three times as long as wide, with four short setae along article on inner margin and one simple and three pinnate setae distally; article-2 with simple seta distally; article-3 almost four times as long as article-2, with apical spur and four distal setae.  
Antenna (Fig. 59B): Article-2 a little longer than wide, with two setae distally, almost twice as long as article-3; article-4 five times as long as wide, with two setae distally; article-5 with one long seta distally; article-6 very short, with five terminal setae.  
 Mouth parts: Labrum (Fig. 59C) hood-shaped, covered by minute setae. Mandible (Figs 59D,E) molar well-developed, longer than incisor with irregular edges; incisor blunt; lacinia mobilis well-developed, crenulated. Maxillule (Fig. 59F) endite with eight apical spiniform setae, palp lost during dissection. Labium (Fig. 59G) withboth lobes poorly separated and sparsely setose distally. Epignath (Fig. 59I) curved, simple distally. Maxilliped (Fig. 59H): coxa reduced; basis fused in heart-shaped plate, 1.5 times as long as wide, with long seta; endite with two tubercles distally; palp article-1 unarmed; article-2 wedge-shaped, with three setae on inner margin and one minute seta on outer margin; article-3 trapezoidal, with four setae on inner margin; article-4 slender, with one simple seta on outer margin and five distal setae.   
Cheliped (Fig. 60A): Basis slightly rounded, 1.8 times as long as wide; merus wedge-shaped, with one seta ventrally; carpus 2.5 times as long as wide, with two setae ventrally and with six minute setae along dorsal margin; propodus slightly shorter than carpus, with distal seta on inner side; fixed finger (propodus projection) tipped by strong spine, with three setae on well-calcified inner margin and two setae ventrally.  
Pereopod-1 (Fig. 60B): Coxa with spur; ischium short, with one seta; merus almost as long as carpus; carpus with three simple setae distally; propodus 1.3 times as long as carpus, with three setae subdistally; dactylus half as long as unguis with one seta; dactylus and unguis combined 0.7 times as long as propodus.  
Pereopod-2 (Fig. 60C): Coxa with spur; basis with three setae along article; ischium with simple seta; merus slightly shorter than carpus, with two simple setae and one spiniform seta distally; carpus a little longer than merus, with three simple setae and one spiniform distally; propodus almost as long as merus and carpus combined, with one spiniform seta ventrally and two setae dorsally; dactylus almost as long as unguis.  
Pereopod-3 (Fig. 60D): Similar to pereopod-2.  
Pereopod-4 (Fig. 60E): Clinging type; basis robust, twice as long as wide, ith two pinnate setae ventrodistally; ischium with two setae; merus with two spiniform setae ventrally; carpus with spine distally and with prickly tubercles; propodus with two spiniform setae ventrally and one dorso-distal seta, a little shorter than dactylus; dactylus three times as long as simple unguis; both almost as long as propodus.  
Pereopod-6 (Fig. 60F): Similar to as pereopod-5, but propodus with three dorso-distal setae.  
Pleopod (Fig. 60G): Basal article naked; exopod with one seta on inner margin and twelve plumose setae on outer margin; endopod with sixteen plumose setae on outer margin; clear gap between proximal seta and other setae.  
Uropods (Fig. 60H): Basal article little longer than wide; both rami two-articled; exopod 0.6 times as long as endopod; proximal article little shorter than distal with one seta distally; distal article with one strong and one small seta distally; endopod proximal article 0.3 times as long as distal article; endopod distal article with one simple and two pinnate seta at middle, tipped by two long, two short and one pinnate setae distally.  
 Distribution: Mediterranean Sea, Sicily, Messina at a depth range of 37– 50 m.
description: Published as part of Błażewicz-Paszkowycz, Magdalena, 2007, Figure 6. Typhlotanais Compactus, Female A In Family Nototanaidae Sieg, 1976 And Typhlotanaidae Sieg, 1984, pp. 1-141 in Zootaxa 1598 on pages 103-107, DOI: 10.5281/zenodo.178692