Members of this species are medium-sized spiders, commonly known as the funnel-web spiders. Their colour is brown, dorsum usually with pattern consisting of a reddish brown folium and a series of pale spots; legs banded. The body consists of prosoma (cephalothorax) and opithosoma. The prosoma takes a pear-shape with brown demarcations. Cephalic region elongated and raised upwards while the thoracic one circular in shape (Fig. 1(A&B). The size is ranging between 8–12 mm (found the male slightly smaller than female and legs more slender). On the ventral side, sternum is wide, heart-shaped (Fig. 1C).
Eyes located on the frontal end of prosoma are eight black eyes arranged into two rows (4:4) and equal in size (Figs. 1D, E&F). Tactile sensory hairs are thin, long, blunt tips and bear buds on the surface. They are distributed on the dorsal side of prosoma and between eyes with different length (Fig. 1(E&F)). Sensilla placodea are oval to nearly circular disc with numerous pores, where they are surrounded by a multi-porous membranous ring, so they are distinguished as plate organs (Fig. 2A). They are located above, or below the cuticular surface. Tactile hairs are distributed on dorsal side of prosoma between eyes of male and female (Fig. 2B&C).
Thickened trichobothria with different length, blunt tip and large prominent sockets are present on the dorsal side of prosoma. This type of trichobothria may act as mechano-chemosensory receptors and detect air vibration and current. Chelicerae are composed of articulated fang with pointed retromarginal and promarginal teeth (Fig. 2D&E). Tactile hairs are accumulated with thickened trichobothria on dorsal and ventral sides of male and female chelicerae (Fig. 2F&G). The stridulatory sense ridges are present on the ventral side of male and female chelicerae (Fig. 2G, H and 3A, B). On female Lycosoides coarctata, there are sensory papillae like sensory warts present around the cheliceral retromarginal and promarginal teeth (Fig. 3B&C). Short tactile curved hairs are distributed on the dorsal side of chelicerae (Fig. 3D&E). Mouthparts of males and females of Lycosoides coarctata are composed of two maxilla and labium. Labium take a triangular shape (Fig. 3F&G).
Sensilla trichodea type1 are a hair-like projection which articulated by a membranous prominent socket so that it is free to move. They are slightly elevated above the cuticle, each sensillum had a straight had a straight, blunt tip that narrowed at the distal region. Trichoid sensillum has a smooth surfaced and blunt-tipped shaft. Slightly curved trichoid sensilla with many tiny sensory hairs on each maxilla are present. The wall of the shaft is perforated by numerous minute pores. There are present on the interior side of maxilla beside the sharped teeth with tactile sensory hairs (Fig. 3H, I, J and K). Female pedipalps are composed of tarsus, tibia, patella and femur (Fig. 4A&B).
Large tactile seta is long as corn-shaped and bears small barbs on lines. This seta inserted into a socket present on the ventral and lateral side of the region near the joint between tarsus and tibia in female pedipalps. Large tactile setae are present on lateral side of the female pedipalps with thickened trichobothria (Fig. 4C&D).
The chemosensitive hairs are a bent hair shaft which is smooth at the base but bears spiny extensions more distally and the hair tip is blunt and exhibits a small pore that connects the outside with dendritic nerve fibers inside the hair shaft. They are present between thickened trichobothria and tactile hairs surrounded by three claws on the female pedipalps (Fig. 4E&F).
Urticating hairs are barbed. When threatened, the spider “kicks” them off using a rear leg. These spiders brush their back legs rapidly across the back of the abdomen. This sends clouds of loosely attached barbed hairs into the eyes, nose, or mouth of the predator chasing them. These are present on the dorsal side of tibia of the female pedipalps (Fig. 4G).
Slit sensilla (Lyriform organ) are slit-shaped holes in the cuticular exoskeleton. They present singly in loose groups and in tight groups called lyriform organ. Lyriform organ are present on the ventral side of the joint between femur and patella of the female pedipalps (Fig. 4H&I). Male Pedipalps consisted of coxa, trochanter and femur are normal. Patella is triangular in shape with two long prominent and slender macro-setae. Tibia is short, covered with hairs and provided with pro-lateral apophasis. Palpal organ is large. Cymbium is slightly rounded, blackish, covered with short and long white hairs and bears a paracymbium near its base. Tegulum is intact. Conductor is highly sclerotized and supporting the embolus. The latter is thick and curled in a semi-circular shape, arising above a large oval median apophasis. Median apophasis is broad at its base and ends with a very long stout spur. Terminal apophasis is dark red and its surface bears small tubercles (Fig. 4J, K &L). Large tactile setae and thickened trichobothria are distributed on the dorsal side of the cymbium of the male pedipalps (Fig. 5A).
Filiform trichobothria are short, thin, bear barbs and with sharp apical end. They are present in straight line with tactile hairs, urticating hairs and single group of slit sensilla on the dorsal side of tibia of the right male pedipalps (Fig. 5B&C and D). Short tactile setae are present on the ventral side of tibia of the right male pedipalps (Fig. 5E).
Opisthosoma of male and female is narrowly oval, tapering posteriorly, covers in dense hairs; dorsum with pattern. Epigynum is sclerotized plate slightly bulging from the opisthosoma, forming a broad dark brownish sclerotized swallow. The latter is fused into a short triangular scape, which in turn widens into two black oval expansions that have prominent rims (Fig. 5F&G). These widens comprise the floor of the two genital openings. Vulva are two openings in the genital plate lead to two short spermathecal ducts that are connected with two globular sperm receptacles. There are two book lungs; one pair of tubular tracheae close to spinnerets (Fig. 5G). Spinnerets are brown and covered with black hairs. The anterior spinnerets are widely separated, the posterior spinnerets are long and slender; two segmented, with apical segment towards tip (Fig. 5H&I). Colulus is reduced to small projection with short black setae. Anal tubercle is dark brown and its tip covered with strong black hairs. On the ventral side of opithosoma there are short anterior spinnerets, long posterior spinnerets and triangular epigynum. Numerous numbers of tactile sensory hairs, urticating hairs and thickened trichobothria cover the dorsal and ventral of opithosoma (Fig. 5J). There are Aciniform spigots with long posterior lateral spinnerets (Fig. 5K).
Walking legs are long, slender and armed with numerous setae. Tarsi on the first left leg with three claws. Long tactile setae and urticating hairs are present on the dorsal side of tarsus and on the joint between tarsus and metatarsus on the male first left leg (Fig. 6A&B). Two types of tactile hairs (long and short), large tactile seta and urticating hairs distributed on ventral and dorsal side of metatarsus, femur and tibia of the first left leg (Fig. 6C, D and E).
Scopulate hairs are the dense adhesive hairs that give many ground spiders the ability to walk on vertical and even overhanging smooth surfaces like glass. These hairs are used for locomotory purposes for many spiders. There are relatively numbers of scopulate hairs on the ventral side of claws (Fig. 6F). Large tactile seta are present on dorsal and ventral side of the joint between tarsus and metatarsus of the male first right leg (Fig. 6G). The scopulate hairs are accumulated on the ventral side of tarsal claws (Fig. 6H&I). Thickened trichobothria and large tactile setae are present on numerous numbers on the dorsal and ventral sides of all walking legs (Fig. 6J&K).