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Syntropis aalbui Lowe, Soleglad and Fet 2007

Syntropis aalbui Soleglad, Lowe and Fet 2007: 122, 123, 126-133, Fig. 3, 16–23, 26–27, 35–36; Tables I–II.

HOLOTYPE: Syntropis aalbui Soleglad, Lowe and Fet, holotype (female), México: Baja California: Blue Palm Canyon, 5 km N Cataviña, 13 July 1979 (Rolf L. Aalbu), permanently deposited in Muséum d’Histoire Naturelle, Genève, Switzerland.

Original description:

"DIAGNOSIS (based on female only, male unknown). Large sized species for its genus, approaching 80 mm in adult females. Overall coloration is a rusty brown; carapace with subtle variegated pattern on medio-posterior area; chelal fingers same color as palm. Pectinal tooth counts 27 in female. Pedipalpal femur and patella are 6.2 and 5.8 times longer than wide in adult females; metasomal segment V is 4.1 times longer than wide in adult females; telson vesicle is 2.3 times longer than deep in adult females.
FEMALE. Description based on holotype female. Locality of holotype is Blue Palm Canyon, 5 km N Cataviña, Baja California, Mexico. Measurements of type specimen is presented in Table I and important diagnostic morphometric ratios are provided in Table II. See Figure 3 for a dorsal view of the female holotype.
COLORATION. Overall color brownish-rust. Carapace with subtle variegated patterns on lateral aspect, from median eyes to posterior edge, but not extending to extreme lateral edges; chelal fingers same color as palm (in preservative, they appear slightly darker). Telson aculeus, eyes and eye tubercles, and articulation condyles of legs dark brown.
CARAPACE (Fig. 17). Anterior edge with very broad indentation, most setae missing; interocular area smooth, bisected by a subtle shallow indentation; posterior lateral aspects covered with medium to large granules in area of variegated pattern, but not extending to extreme lateral areas which are smooth. Posterior portion with deep medial groove, forming two conspicuous lateral posterior convexed lobes. Lateral eyes number three, decreasing in size posteriorly. Median eye tubercle thin, positioned anteriorly of middle with the following length and width formulas: 345/870 and 103/640.
MESOSOMA (Fig. 19). Tergites I–VI smooth, tergite VII with two pairs of crenulate carinae. Sternites smooth and lustrous; one pair of ventral lateral carinae present, irregular, weakly granulate, median pair absent. Stigmata (Fig. 19) are long and slit-like.
METASOMA (Fig. 22). Segments I–IV: dorsal and dorsolateral carinae delicately crenulate, dorsolateral (I–III) carinae terminate with small spine; lateral carinae delicately crenulate on I, crenulate on proximal 17% of II, and obsolete on III–IV; ventrolateral smooth to granulate on I–III and crenulate on posterior three-quarters of IV; and single ventromedian carina of I widely rounded and smooth, smooth on II, smooth to crenulate on III, and crenulate on most of IV. Dorsolateral carinae of segment IV terminus subtly flared, not terminating at articulation condyle. Segment V: dorsolateral carinae rounded and granulate; lateral carinae granulated for 50% of anterior aspect; ventrolateral and ventromedian carinae crenulate, ventromedian carina not bifurcated, terminating in straight line. Intercarinal areas smooth. Ventral setal formulae (I–V): 4/5/5/6/6 (not all setae present, some missing).
TELSON (Figs. 35–36). Vesicle bulbous with short aculeus; aculeus with 2/3 denticles in the LAS. Vesicle surface smooth, covered ventrally with numerous elongated setae; basal dorsal aspect with vesicular “tabs” terminating in small hooked spine.
PECTINES. Well developed elongated segments exhibiting length/width formula 770/185. Three anterior lamellae and 18/x bead-like middle lamellae; fulcra of medium development. Teeth number 27/x (note right pecten is missing). Sensory areas developed along most of tooth inner length on all teeth, including basal tooth. Basal piece quite large, with deep indentation along anterior one-half, length|width formula 195/215.
GENITAL OPERCULUM. Sclerites connected for entire length, operating as a single unit, connection to body at extreme anterior edge, 80% of sclerites are separated from mesosoma. No genital papillae.
STERNUM. Type 2, posterior emargination present, well defined convex lateral lobes, apex visible but not conspicuous; slightly wider than long, length|width formula 215/205; sclerite tapers anteriorly.
CHELICERAE (Fig. 18). Movable finger dorsal edge with two subdistal (sd) denticles; ventral edge smooth; setal brush and serrula on ventral edge barely discernible due to worn condition of chelicerae. Ventral distal denticle (vd) longer than dorsal (dd) counterpart. Fixed finger with four denticles, median (m) and basal (b) denticles conjoined on common trunk; no ventral accessory denticles present.
PEDIPALPS (Figs. 16, 23, 26–27). Slender chelate species. Femur (Fig. 26): Dorsointernal, dorsoexternal and ventrointerior carinae delicately crenulate, ventroexternal rounded to obsolete. Dorsal and ventral surfaces smooth, internal and external surfaces with line of large granules.
Patella (Fig. 27): Dorsointernal, dorsoexternal, ventrointernal and ventroexternal carinae delicately crenulate; Dorsal Patellar Spur (DPSc) carina well developed with line of about 33 granules; exteromedian carina obsolete. All surfaces smooth; internal surface with remnants of a DPS and VPS, each represented by a small solitary granule accompanied with a seta. Chelal carinae: digital (D1) carina weak and smooth; subdigital (D2) represented basally by one granule; dorsosecondary (D3) rounded and rough; dorsomarginal (D4) and dorsointernal (D5) rounded, irregularly granulose; ventroexternal (V1) smooth, terminating at external condyle of movable finger; ventromedian (V2) irregular and rough; ventrointernal (V3) rounded and smooth; external (E) obsolete. Chelal finger dentition (Fig. 16): median denticle (MD) row groups aligned in straight line, numbering 6 and 7 (counting the distal single MD denticle as a group on the movable finger); 6/6 and 8/8 internal denticles (ID) and 5/5 and 6/6 outer denticles (OD) on fixed and movable fingers, respectively. OD denticles are situated on the distal half of both fingers. No accessory denticles present. Number of MD denticles on movable finger is 100. Distal tips of both fingers with conspicuous “whitish” patch. Trichobothrial patterns (Fig. 23): Type C, orthobothriotaxic. Femur: trichobothrium d located next to dorsoexternal carina and proximal to i. Patella: ventral trichobothrium v3 located on external surface, adjacent to trichobothrium et3. Chela: trichobothrium Dt located at palm midpoint and Db positioned dorsal of D1 carina; ibit straddle inner denticle (ID) six of fixed finger; spacing between trichobothria V1 and V2 approximately same as V2 and V3.
LEGS
(Figs. 20–21). Both pedal spurs present, tibial spur absent. Tarsus with single median row of spinules on ventral surface, terminating distally with three spinule pairs."

subsequent accounts: N./A

distribution: NORTH AMERICA. México: Baja California - Blue Palm Canyon, near Cataviña.

Published Records:  Known only from holotype.

notes: Soleglad, Lowe and Fet () named this species "in honor of Dr. Rolf L. Aalbu, entomologist and student of Baja California. In particular, Dr. Aalbu was the collector of the type specimen."

 

 


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